Mine is that the useState hook is an actual plague on the entire React ecosystem. Regardless of your opinions of React, if you wanna use something then use it right.
If someone wanted to take your rights away, maybe even didn't believe you should be allowed to be alive, would you be unprofessional for not wanting to use software they make? Would you be unprofessional for making your own version of that if the project refused to remove them as the lead? No. You wouldn't. A way to solve that problem as a professional is to fork the project. What's not professional is calling people doing that unprofessional.